The Defiant was less able than a Hurricane with or without a turret. Yes, it was superior to the Roc, but the best way for such aircraft would have been not to be. Boulton Paul built the Roc because Blackburn was busy building the Botha. It's hard to find a circumstance where the No Name Fighter might have entered the fray. Using my "scientific" method, I have determined that the F5/34 wing was thinner than the Hurri wing, of reasonable area, and provided endearing characteristics. The undercarriage was clumsy and intrusive of superb performance, but it was long enough to provide sufficient clearance for a larger propeller, as would be fitted to a more powerful engine, and, following the use on American naval fighters, an aid in glide bombing. An possible engine for the No Name has always been chosen from the ranks of the round engines, but none of Roy's Bristols quite hit the mark except perhaps the Hercules, heavy and slow in development, or Taurus, unreliable and underpowering. A natural fit is the P&W R-1830, of uncertain availability in the time frame, and with limited power capabilities for superior development. That leaves only an engine not round, and critically, under priority call to power Defiant, Battle, Henley, Whitley and more.
The No Name, we'll call it the Eastwood, was produced in quantity two, and the first, which provided the quoted speed numbers, had no armament. There's a considerable lack of details available, and I can't say with certainty if the second one had guns fitted, although it did have the gun tubes installed. Further military equipment was also omitted, without doubt, and the fuel volume was decidedly inadequate. Details for the possibility of fitting larger fuel volume are forever lacking. Still, it does look like a Zero, but has better ailerons, by Mr. Frise. Nobody who flew it had an unkind word. It's no Spitfire, but it's not chopped liver either. Yes, the wing spar runs one piece tip to tip, like Zero, but the Seafire wing fold wasn't located at a break in the spar. They made one. Like John Kennedy said, they could do it because it was hard.
Production wouldn't be a problem. There's a man with a factory looking for a contract, goes by the name of Folland.